Thank you for the additional information. The fact that their names are ***** ***** deed complicates this greatly. Your Mom needs to file an action in Court to declare that the three children have abandoned their claim to the real estate and that the title to the property should be vested solely in her name.
This type of law suit is called a "Quiet Title" action. A Quiet Title action is not simple. There are many specific details and time-sensitive notifications that must take place. The process can take anywhere from six to twelve months. Quiet Title is usually used in TAx Sales, but it would be the process here too.
Your best bet is to use a Real Estate Attorney. You can use this link to find one:
The amount of information that you need to do this yourself is massive, and I do not have room to provide you a step by step process (it is too complicated). But if you visit a local law library, ask the librarian for the Forms books. The forms book has almost every legal form that you may need.
I am sorry that I can not provide more detailed step by step information for you. I can not even find a layman's guide on this for you.
Although I have provided you information that can get you started, I will opt out so that another expert may be able to assist you. The question will repost at no charge to you. No need to rate me on this question.